Sports Car (2000 Engine)

Engine must be at normal operating temperature before adjusting carburetors.

1. Inspect damper oil in carburetors. Remove air cleaners, make sure pistons are free in their chambers. Connect tachometer and timing light. Start engine and adjust engine speed to 800-1000 RPM (1968-69 models) and 1000-1500 RPM (1970 models). Using a suitable carburetor synchronizer, balance air intake on both carburetors.
2. Push throttle control knob (located on dashboard) all the way in. Turn throttle adjusting screws on both carburetors to obtain an engine speed of 700 RPM, making sure carburetor air intake is synchronized. Screw in mixture adjusting nuts on both carburetors until they touch idle lock nuts, then turn mixture adjusting nuts back out 1/2 turn.
   Fig 1: DATSUN AIR INJECTION SYSTEM (240Z)

   Courtesy of NISSAN NORTH AMERICA, INC.
   NOTE: Do not adjust idle lock nuts.
3. Set ignition timing at TDC. If engine speed changes, adjust by turning both throttle adjusting screws equal amounts. Timing should remain at TDC at 700 RPM. If using a CO meter, turn mixture adjusting nuts on both carburetors (equal amounts) to obtain a CO reading of 2.0±0.2%. If engine speed changes, adjust by turning both throttle adjusting screws equal amounts to obtain 700 RPM at TDC.